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In page Tape recorder:

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The storage of an analog signal on tape works well but is not perfect. In particular, the granular nature of the magnetic material adds high-frequency noise to the signal, generally referred to as tape hiss. Also, the magnetic characteristics of tape are not linear. They exhibit a characteristic hysteresis curve, which causes unwanted distortion of the signal. Some of this distortion is overcome by using an inaudible high-frequency AC bias when recording. The amount of bias needs careful adjustment for best results as different tape material requires differing amounts of bias. Most recorders have a switch to select this.[a] Additionally, systems such as Dolby noise reduction systems have been devised to ameliorate some noise and distortion problems.[citation needed]